# 65

## 65 is an odd composite number composed of two prime numbers multiplied together.

What does the number 65 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

65 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

## Prime factorization of 65:

### 5 × 13

See below for interesting mathematical facts about the number 65 from the Numbermatics database.

### Names of 65

• Cardinal: 65 can be written as Sixty-five.

### Scientific notation

• Scientific notation: 6.5 × 101

### Factors of 65

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 18

### Divisors of 65

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 84
• Sum of proper divisors (its aliquot sum) s(n): 19
• 65 is a deficient number, because the sum of its proper divisors (19) is less than itself. Its deficiency is 46

### Bases of 65

• Binary: 10000012
• Base-36: 1T

### Squares and roots of 65

• 65 squared (652) is 4225
• 65 cubed (653) is 274625
• The square root of 65 is 8.0622577483
• The cube root of 65 is 4.0207257585

### Scales and comparisons

How big is 65?
• 65 seconds is equal to 1 minute, 5 seconds.
• To count from 1 to 65 would take you about thirty-two seconds.

This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 65 cubic inches would be around 0.3 feet tall.

### Recreational maths with 65

• 65 backwards is 56
• The number of decimal digits it has is: 2
• The sum of 65's digits is 11
• More coming soon!